PUNCH RETAINER ASSEMBLY

摘要

A punch retainer has a bore formed completely therethrough including a first portion and a second portion of greater cross-sectional dimension than the first portion, the second bore portion being threaded. A button head type punch includes a body received in the first bore portion and an enlarged head which is received in the second bore portion. Backup means in the form of a threaded plug is threaded within the second bore portion and engages the head of the punch to positively hold the punch in position and to prevent relative axial movement of the punch with respect to the retainer. A plurality of annular spacer members are positioned between the head of the punch and an annular shoulder formed in the punch retainer.